Simple and robust method for rapid cooling of 87Rb to quantum degeneracy

• 来源期刊: 中国物理B（英文版）
• 关键词: optical phase lock loop laser cooling Bose–Einstein condensates
• 年，卷（期）: 2020,（6）
• 页码范围: 232-237
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/1674-1056/ab8625

摘要

We demonstrate a simple and fast way to produce 87Rb Bose–Einstein condensates. A digital optical phase lockloop (OPLL) board is introduced to lock and adjust the frequency of the trap laser, which simplifies the optical design and improves the experimental efficiency. We collect atoms in a magneto-optical trap, then compress the cloud and cut off hot atoms by rf knife in a magnetic quadrupole trap. The atom clouds are then transferred into a spatially mode-matched opticaldipole trap by lowering the quadrupole field gradient. Our system reliably produces a condensate with 2 × 106 atoms every 7.5 s. The compact optical design and rapid preparation speed of our system will open the gate for mobile quantum sensing.